[issue11284] slow close file descriptors in subprocess, popen2, os.popen*

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

Benchmark extracted from #11314, Python 3.2 on Linux: subprocess("/bin/false", close_fds=True) is 22% slower than subprocess("/bin/false", close_fds=False).

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stage:  -> patch review

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11284>
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